CN117630151A - Device and method for detecting chlorine and hydrogen chloride respectively with high sensitivity by ion mobility spectrometry of non-radioactive ionization source - Google Patents
Device and method for detecting chlorine and hydrogen chloride respectively with high sensitivity by ion mobility spectrometry of non-radioactive ionization source Download PDFInfo
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- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 title claims abstract description 59
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Abstract
The invention discloses a device and a method for measuring chlorine and hydrogen chloride in an atmospheric environment respectively with high sensitivity by using a VUV lamp-ion mobility spectrometry. The invention is based on anion mode ion mobility spectrometry, a novel vacuum ultraviolet lamp ionization source is adopted, organic compounds with ionization energy smaller than 10.04ev such as auxiliary reagent molecule butanone in carrier gas of IMS generate reagent ions, then dissociation electrons are generated with chlorine and hydrogen chloride in a sample to capture and react to generate hydrated ions of chlorine, then the ions enter a migration zone, and finally reach Faraday discs in a migration tube in sequence in a uniform electric field to be detected. The method realizes Cl alignment based on VUV-ion mobility spectrometry 2 And HCl on-line monitoring, which presents the remarkable advantages of high resolution, high sensitivity and real-time monitoring, can detect the chlorine and hydrogen chloride contents in different environments, has high response speed and has wide application for real-time on-line detection of the chlorine and hydrogen chloride contents in the airThe application prospect is good.
Description
Technical Field
The invention relates to a device and a method for respectively detecting chlorine and hydrogen chloride by using a non-radioactive ionization source ion mobility spectrometry, and belongs to the technical field of ion mobility spectrometer analysis.
Background
Chlorine (Cl) 2 ) Highly toxic gases with a pungent odor are widely used in the water purification of paper mills, pulp bleaching of paper mills, pesticide production and chemical and pharmaceutical industries; cl 2 As a precursor to Cl atoms, volatile Organic Compounds (VOCs) are oxidized to produce O 3 . And Cl 2 Enters the lung through the respiratory system and can react with water in the lung mucosa to generate hydrochloric acid; thus, exposure to high concentration of Cl 2 May be fatal to humans; exposure to low concentration of Cl 2 The respiratory disease is aggravated and the eye is irritated. Detection of Cl through the nose of a person 2 The threshold concentration of the gas smell is 0.1-0.3ppm, but Cl 2 Is about 34ppb. Therefore, it is necessary to develop a high sensitivity gas detector to detect Cl at ppb level 2 And (3) gas.
Hydrogen chloride (HCl) gas is also used as a precursor of Cl atoms and mainly originates from complete combustion of halogenated polymers such as polyvinyl chloride, fertilizer production, electroplating, rubber industry and absorption towers of semiconductor factories. HCl gas is very soluble in water to form hydrochloric acid, which is a component of acid rain; severe corrosion effects on metals, facilities and buildings are also associated with HCl. The hydrochloric acid gas can be inhaled into human body through respiratory system, and can cause throat mucosa irritation, nasal erosion ulcer and gastrointestinal tract diseases after long-term contact. In the national standard, the discharge standard of battery industry pollution, the discharge standard of glass industry atmospheric pollutants, the discharge standard of pharmaceutical industry atmospheric pollutants, the discharge standard of petrochemical industry pollutants and the discharge standard of electronic glass industry atmospheric pollutants are all described as followsFor Cl 2 And the emission limits of HCl and the boundary atmospheric pollution concentration limits of the enterprise are well defined. In order to minimize the risk, it is important to monitor the contaminants in situ and in real time. In order to determine these toxic gases in the environment, several methods and instrumentation techniques have been developed.
Over the last decades, a number of techniques have been developed for monitoring Cl in the atmosphere 2 And HCl; detection of Cl in national standard 2 The method for preparing the HCl is as follows: methyl orange spectrophotometry, iodometry, mercury thiocyanate spectrophotometry, silver nitrate capacity method and ion chromatography as Cl in the atmosphere 2 And HCl monitoring standard methods, which all require complex pretreatment processes, have long analysis time and cannot realize online real-time monitoring; in addition, many spectroscopic techniques such as ultraviolet differential spectroscopy (DOAS), high resolution infrared emission spectroscopy, and tunable laser absorption spectroscopy (TDLAS), while having the advantages of simple instrumentation and fast response time, unfortunately, the typical drawbacks of spectroscopy are low sensitivity, insufficient resolution, severe interference with water and carbon dioxide, and the like. The ion mobility spectrometry has the advantages of high sensitivity, quick response time and on-line monitoring, but the ion mobility spectrometry can only detect the total chlorine concentration and cannot realize the separate detection of two gases.
Disclosure of Invention
The invention provides a device and a method for detecting chlorine and hydrogen chloride respectively with high sensitivity by ion mobility spectrometry of a non-radioactive ionization source, which aims to solve the problems in the prior art, and is based on ion mobility spectrometry technology (Ion Mobility Spectrometry, IMS) with high sensitivity and quick response time, wherein a cold trap is used as pretreatment to remove HCl in mixed sample gas to detect Cl 2 Total chlorine minus Cl 2 And (3) obtaining HCl so as to realize the new method for separately detecting the mixed sample gas. The invention has the remarkable advantages of high resolution, high sensitivity and real-time monitoring, can detect the contents of chlorine and hydrogen chloride in different environments, and has high response speed. Cl 2 Sensitivity up to 1.07mv/ppb, response time<1s, the detection limit is better than 4.24ppb; HCl sensitivity up to 4.83mv/ppb, response time<1s, the detection limit is better than 1.65ppb; has obvious advantages over the traditional method and wide applicationThe application prospect is good.
The technical scheme adopted by the invention is as follows:
the invention provides a device for detecting chlorine and hydrogen chloride respectively with high sensitivity by ion mobility spectrometry of a non-radioactive ionization source, which comprises a negative ion mode photoelectric ion mobility spectrometer, a flowmeter, a doping agent, a tail gas pump, a gas source, a three-way valve and a cold trap;
the ion mobility spectrometer is a hollow cavity formed by coaxially and alternately placing, extruding and sealing an insulating ring and an electrode ring; one end of the ion mobility spectrometer is provided with an ionization source, and one side, close to the ionization source, of the outer wall of the ion mobility spectrometer is sequentially provided with a tail gas interface 12, a carrier gas inlet 5 and a sample inlet 8; the carrier gas inlet 5 is sequentially connected with the doping agent 4 and the flowmeter II 3; the sample inlet 8 is connected with an interface at one end of the three-way valve 7, and an upper gas path at the other end of the three-way valve 7 is connected with the sample gas 6 for detecting the total chlorine concentration; the lower gas path at the other end of the three-way valve 7 is connected with the sample gas 6 passing through one end of the cold trap 9 and is used for detecting the concentration of chlorine; the outer wall of the other end of the ion mobility spectrometer is provided with a drift gas inlet 2 connected with a flowmeter I1. The reason for using the three-way valve is that the ion mobility spectrometry adopts two sampling modes, and the total chlorine concentration is detected when the upper end of the three-way valve is connected with the port; the chlorine concentration is detected when the lower end of the three-way valve is connected with the port. The reason for using the cold trap is to remove HCl in the mixed sample gas to detect the concentration of chlorine gas.
Further, in the above technical solution, the cold trap 9 is provided with a cold trap purge gas inlet 10 and a cold trap purge gas outlet 11, and the purge gas enters the cold trap 9 from the cold trap purge gas inlet 10, purges the cold trap 9, and is blown out from the cold trap purge gas outlet 11.
Further, in the above technical solution, the exhaust port 12 is sequentially connected with a flow meter iii 13 and an air pump 14; the floating gas inlet 2 is connected with a flowmeter I1.
The invention also provides a method for detecting chlorine and hydrogen chloride respectively with high sensitivity by adopting the device, wherein a gas sample 6 enters an ion mobility spectrometer through a three-way valve 7 and a sample port 8 and is used for detecting the total chlorine concentration; sample gas 6 enters the ion mobility spectrometer through a cold trap 9, a three-way valve 7 and a sample port 8 and is used for detecting the concentration of chlorine; the drift gas is controlled to enter the ion mobility spectrometer through a drift gas inlet 2 by a flowmeter I1; the doping agent 4 is purged by air and is controlled to enter the ion mobility spectrometer through a carrier gas port 5 by a flowmeter II 3; the exhaust gas from the exhaust port 12 is discharged from the air pump 14 via the flowmeter iii 13. Dopant molecules in the dopant 4 enter the ion mobility spectrometry from a carrier gas port 5. The reagent molecules firstly generate enough reagent ions through direct photoionization, then generate hydrated ions of chlorine through dissociation electron capture reaction of the reagent ions and sample molecules (chlorine and hydrogen chloride) to realize ionization of the sample molecules, and the sample ions reach a Faraday disk through a migration zone to be detected, and obtain ion migration spectrograms of the chlorine and the total chlorine through a signal amplifier and a signal acquisition and display device.
Further, in the above technical solution, the ion mobility spectrometry ionization source is a vacuum ultraviolet lamp; the working mode is an anion mode; the flow rate of the floating gas is 200-300 mL/min, the sample injection flow rate is 300-400 mL/min, and the flow rate of the carrier gas is 100-150 mL/min.
Further, in the above technical solution, the bleaching gas is purified dry air, and the carrier gas is purified dry air gas for blowing the dopant; the purified dry air is the dry air treated by the molecular sieve; the dopant molecule is an ionizable organic solvent, and the organic solvent is an organic compound with ionization energy smaller than 10.04ev such as butanone.
Further, in the above technical scheme, during sample injection, sample gas enters the ion mobility spectrometer through air suction sampling under atmospheric pressure, reagent molecules firstly generate enough reagent ions through direct photoionization, then ionization of the sample molecules is realized through dissociation electron capture reaction of the reagent ions and the sample molecules, and the sample ions reach the Faraday disc through a migration zone to be detected.
Further, in the technical scheme, the ion mobility spectrometry of the non-radioactive ionization source is used for directly detecting the mixed standard gas of chlorine and hydrogen chloride to obtain the ion mobility spectrometry of total chlorine; chlorine gas and hydrogen chloride mixed standard gas passing through cold trap is detected by using non-radioactive ionization source ion mobility spectrometry to obtain chlorineIon mobility spectrum of gas. Then according to Cl - And the migration time position in the spectrogram enables chlorine and total chlorine to be qualitatively detected. Obtaining chlorine series Cl - The intensity of the peak at the time position in the spectrogram, and making a standard curve for measuring chlorine according to the analog curve of peak intensity-concentration; obtaining total chlorine series Cl - The signal intensity of the hydrogen chloride is obtained by subtracting the signal intensity of the chlorine from the total chlorine signal intensity by 1.338, and a standard curve for measuring the hydrogen chloride is made according to a simulation curve of the peak intensity-concentration; measuring Cl of unknown sample - The intensity of the peak at the response time, the level of chlorine and hydrogen chloride in the sample was obtained.
The invention is based on anion mode ion mobility spectrometry, a novel vacuum ultraviolet lamp ionization source is adopted, organic compounds with ionization energy smaller than 10.04ev such as auxiliary reagent molecule butanone in carrier gas of IMS generate reagent ions, then dissociation electrons are generated with chlorine and hydrogen chloride in a sample to capture and react to generate hydrated ions of chlorine, then the ions enter a migration zone, and finally reach Faraday discs in a migration tube in sequence in a uniform electric field to be detected.
The invention adopts a novel non-radioactive radio frequency Vacuum Ultraviolet (VUV) lamp ionization source and is based on an ion mobility spectrometry of a negative ion mode. First, the ultraviolet rays emitted from the VUV lamp irradiate reagent molecules having ionization energy lower than photon energy, and the reagent molecules are photoionization-generated a large amount of low-energy electrons. Oxygen molecules and ozone molecules in the air can capture low-energy electrons generated by photoionization of reagent molecules to form O 2 - And O 3 - O formed of 2 - And O 3 - Can be combined with trace water molecules in the air to form corresponding hydrated ions O 2 - (H 2 O) n And O 3 - (H 2 O) m O because ozone has higher electron affinity than oxygen molecules 2 - (H 2 O) n O that can react with ozone to form part of charge transfer reaction 3 - (H 2 O) n Since the air contains about 300ppm of CO 2 O can be formed at 0.4. Mu.s 3 - (H 2 O) n Rapidly convert into CO 3 - (H 2 O) n 。O 2 - (H 2 O) n (hereinafter referred to as O) 2 - ) And CO 3 - (H 2 O) n (hereinafter referred to as CO) 3 - ) Namely two reagent ions. Cl 2 And O, by which ionization of HCl is predominantly dependent 2 - The reaction of dissociative electron capturing reaction is carried out to lead chlorine and hydrogen chloride in the reaction product to react to generate Cl - (H 2 O) n (hereinafter abbreviated as Cl) - ) Finally, the ions enter an ion migration tube, are separated in a uniform electric field, and reach Faraday discs in the migration tube in sequence to be detected.
The invention has the beneficial effects that:
1. the method realizes the simultaneous detection of chlorine and hydrogen chloride; has high sensitivity to chlorine and hydrogen chloride gas, cl 2 Sensitivity up to 1.07mv/ppb, response time<1s, the detection limit is better than 4.24ppb; HCl sensitivity up to 4.83mv/ppb, response time<1s, the detection limit is better than 1.65ppb; the method can completely realize vehicle-mounted cruising monitoring and on-site real-time monitoring, and the added dopant molecules can remove a part of possible interference, so that the detection is more accurate and reliable, and compared with the traditional detection methods such as an ion selective electrode method, a mercury thiocyanate colorimetric method, an ion chromatographic method and the like, the method can not realize simultaneous detection of chlorine and hydrogen chloride, can not realize on-line monitoring, has the problems of lower sensitivity and the like, and has obvious advantages and wide application prospect.
2. The method has extremely high analysis speed and response time of <1s, and can meet the requirements of monitoring the chlorine and hydrogen chloride contents and early warning of leakage in industrial parks and production workshops.
3. The method has the advantages of simple operation, simple and quick instrument, small volume and easy carrying, is suitable for on-site on-line monitoring of chlorine and hydrogen chloride in various environments, and has wide application prospect.
Drawings
FIG. 1 is a diagram showing the structure of the method for detecting chlorine and hydrogen chloride gas in a non-radioactive ionization source ion mobility spectrometry method for detecting chlorine and hydrogen chloride, respectively;
the device comprises a 1-flowmeter I, a 2-drift gas inlet, a 3-flowmeter II, a 4-doping agent, a 5-carrier gas inlet, a 6-sample gas, a 7-three-way valve, an 8-sample inlet, a 9-cold trap, a 10-cold trap purge gas inlet, a 11-cold trap purge gas outlet, a 12-tail gas interface, a 13-flowmeter III and a 14-air pump.
FIG. 2 is a background spectrum of ion mobility spectrometry when butanone was used as a dopant.
FIG. 3 is a standard spectrum of ion mobility spectrometry for chlorine gas.
FIG. 4 is a standard spectrum of ion mobility spectrometry for hydrogen chloride.
FIG. 5 is a standard curve of the RF lamp vacuum ultraviolet lamp ionization source ion mobility spectrometry for chlorine gas measurement.
Fig. 6 is a standard curve of the rf lamp vacuum uv lamp ionization source ion mobility spectrometry for hydrogen chloride.
Detailed Description
The following examples illustrate the use of the invention, but do not limit the scope of application.
Example 1
As shown in figure 1, the device for separately detecting chlorine and hydrogen chloride by using the non-radioactive ionization source ion mobility spectrometry comprises an anion mode ion mobility spectrometer, a flowmeter, a doping agent, a tail gas pump, a gas source, a three-way valve and a cold trap;
the ion mobility spectrometry is a hollow cavity formed by coaxially and alternately placing, extruding and sealing an insulating ring and an electrode ring; one end of the ion mobility spectrometry is provided with an ionization source, and one side, close to the ionization source, of the outer wall of the ion mobility spectrometry is sequentially provided with a tail gas interface 12, a carrier gas inlet 5 and a sample inlet 8; the carrier gas inlet 5 is sequentially connected with the doping agent 4 and the flowmeter II 3; the sample inlet 8 is connected with an interface at one end of the three-way valve 7, and a gas circuit at the other end of the three-way valve 7 is connected with the sample gas 6; the lower gas path at the other end of the three-way valve 7 is connected with the sample gas 6 passing through one end of the cold trap 9; the cold trap 9 is provided with a cold trap purge gas inlet 10 and a cold trap purge gas outlet 11, the purge gas at the other end of the cold trap 9 enters the cold trap 9 from the cold trap purge gas inlet 10, and the purge cold trap 9 is blown out from the cold trap purge gas outlet 11; and a drift gas inlet 2 is arranged on the outer wall of the other end of the ion mobility spectrometry. The tail gas interface 12 is sequentially connected with a flow meter III 13 and an air pump 14; the floating gas inlet 2 is connected with a flowmeter I1. The reason for using the three-way valve is that the ion mobility spectrometry adopts two sampling modes, and the total chlorine concentration is detected when the upper end of the three-way valve is connected with the port; the chlorine concentration is detected when the lower end of the three-way valve is connected with the port. The reason for using the cold trap is to remove HCl in the mixed sample gas to detect the concentration of chlorine gas.
Example 2
As shown in fig. 1, a non-radioactive ionization source ion mobility spectrometry apparatus for separately detecting chlorine gas and hydrogen chloride gas comprises the apparatus described in example 1; the ion mobility spectrometer comprises four air ports, wherein a tail gas interface 12, a carrier gas inlet 5, a sample inlet 8 and a drift gas inlet 2 are sequentially arranged from left to right, clean air is taken as drift gas to enter from the drift gas inlet 2 of the ion mobility spectrometer through a flowmeter I1, and carrier gas is taken from the carrier gas inlet 5 of the ion mobility spectrometer through a flowmeter II 3 with a doping agent (butanone) 4; the sample gas 6 is directly communicated with a sample inlet 8 of the anion mode photoionization mobility spectrometer through a three-way valve 7 to obtain total chlorine; the sample gas 6 is directly communicated with a cold trap 9 and a three-way valve 7 to obtain chlorine through a sample inlet 8 of the negative ion mode photoionization mobility spectrometer; the air pump 14 is connected with the tail gas interface 12 of the ion mobility spectrometry through the flowmeter III 13.
Example 3
A new method for detecting chlorine and hydrogen chloride by adopting a non-radioactive ionization source ion mobility spectrometry respectively adopts a radio-frequency non-radioactive ionization source VUV lamp as an ionization source, wherein the voltage of a migration area is set to 600V/cm, the drift gas flow is set to 300mL/min, the tail gas flow is set to 800mL/min, the sampling amount is 400mL/min, and the background spectrogram of the instrument is shown in figure 2 when the carrier gas flow is 100 mL/min. And diluting the standard gas with purified clean air or humid air to prepare standard samples with different concentrations. Dry air (0% RH) was mixed with saturated air (100% RH) to produce a humid air simulated atmospheric humidity (20% RH-90% RH) with a defined Relative Humidity (RH). Clean air with humidity (50% RH) is used as dilution gas by a dynamic dilution gas distribution systemSeparately preparing Cl with concentration of 40ppb 2 Standard gas and HCl standard gas to obtain a new peak at 2.435ms when the sample contains chlorine gas or hydrogen chloride component, the peak is Cl - As shown in fig. 3 and 4, the intensity of the peak can be used to characterize the chlorine and hydrogen chloride content, respectively.
Example 4
A dynamic dilution gas distribution system is adopted, clean air with humidity (50% RH) is used as dilution gas, and mixed standard gas of chlorine and hydrogen chloride with a series of concentrations is prepared: 40ppb, 80ppb, 120ppb, 160ppb, 200ppb. The method is used for detecting and obtaining the ion mobility spectrogram of the chlorine gas with the concentration and the total chlorine standard gas. Extracting the intensity of an ion spectrum peak of 2.435ms, plotting the intensity of the peak and the corresponding concentration, and obtaining a calibration curve for detecting chlorine and hydrogen chloride by an ion mobility spectrometry through calculation, wherein as shown in fig. 5 and 6, the detection limit of the chlorine gas reaches 4.24ppb, and the sensitivity can reach 1.07mv/ppb as can be seen from fig. 5; as can be seen from FIG. 6, the detection limit of the hydrogen chloride gas was 1.65ppb, and the sensitivity was 4.83mv/ppb.
The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will occur to those skilled in the art from consideration of this specification without the exercise of inventive faculty, and such equivalent modifications and alternatives are intended to be included within the scope of the invention as defined in the claims appended hereto.
Claims (9)
1. The utility model provides a device that nonradioactive ionization source ion mobility spectrometry high sensitivity detected chlorine and hydrogen chloride respectively which characterized in that: the ion mobility spectrometer comprises a hollow cavity formed by coaxially and alternately placing, extruding and sealing an insulating ring and an electrode ring; an ionization source is arranged at one end of the ion mobility spectrometer, and a tail gas interface (12), a carrier gas inlet (5) and a sample inlet (8) are sequentially arranged on one side, close to the ionization source, of the outer wall of the ion mobility spectrometer; the carrier gas inlet (5) is sequentially connected with the doping agent (4) and the flowmeter II (3); the sample inlet (8) is connected with an interface at one end of the three-way valve (7), an upper gas path at the other end of the three-way valve (7) is directly connected with the sample gas (6), and a lower gas path at the other end of the three-way valve (7) is connected with the sample gas (6) passing through the cold trap (9); the outer wall of the other end of the ion mobility spectrometer is provided with a gas bleaching inlet (2) connected with a flowmeter I (1).
2. The apparatus according to claim 1, characterized in that the cold trap (9) is provided with a cold trap purge gas inlet (10) and a cold trap purge gas outlet (11).
3. The device according to claim 1, characterized in that the exhaust gas interface (12) is connected in sequence to a flow meter iii (13) and an extraction pump (14).
4. A method for high-sensitivity detection of chlorine and hydrogen chloride respectively according to any of claims 1-3, characterized in that the sample gas (6) enters the ion mobility spectrometer through a three-way valve (7) and a sample port (8) for detecting the total chlorine concentration; sample gas (6) enters an ion mobility spectrometer through a cold trap (9), a three-way valve (7) and a sample port (8) and is used for detecting the concentration of chlorine; the drift gas is controlled to enter the ion mobility spectrometer through a drift gas inlet (2) by a flowmeter I (1); the doping agent (4) is purged by air and is controlled to enter the ion mobility spectrometer through a carrier gas port (5) by a flowmeter II (3); the tail gas of the tail gas interface (12) is discharged by a sucking pump (14) through a flowmeter III (13); dopant molecules in the dopant (4) enter an ion mobility spectrometer from a carrier gas inlet (5), reagent molecules firstly generate enough reagent ions through direct photoionization, then generate sample ions through dissociation electron capture of the reagent ions and sample molecules, the sample ions reach a Faraday disc through a migration area to be detected, and the ion mobility spectrograms of chlorine and hydrogen chloride are obtained through a signal amplifier and a signal acquisition and display device.
5. The method of claim 4, wherein the rinse gas is purified dry air; the carrier gas is purified dry air for sweeping the doping agent; the purified dry air is the dry air treated by the molecular sieve.
6. The method of claim 4, wherein the ion mobility spectrometer is a photoionization ion mobility spectrometer; the ionization source of the ion mobility spectrometer is a vacuum ultraviolet lamp; the working mode is an anion mode; the flow rate of the floating gas is 200-300 mL/min, the sample injection flow rate is 300-400 mL/min, and the flow rate of the carrier gas is 100-150 mL/min.
7. The method of claim 4, wherein the dopant molecule is an ionizable organic solvent and the organic solvent is butanone.
8. The method according to claim 4, characterized in that during the sample injection, the sample gas (6) is sampled by inhalation at atmospheric pressure into the ion mobility spectrometer, the reagent molecules are first subjected to direct photoionization to generate sufficient reagent ions, then the ionization of the sample molecules is realized by the dissociated electron capture reaction of the reagent ions and the sample molecules, and the sample ions reach the faraday plate through the migration zone to be detected.
9. The method according to claim 4, wherein the ion mobility spectrometry of total chlorine is obtained by detecting a mixed standard gas of chlorine and hydrogen chloride using a non-radioactive ionization source ion mobility spectrometry; detecting the mixed standard gas of the chlorine and the hydrogen chloride passing through the cold trap by using a non-radioactive ionization source ion mobility spectrometry to obtain an ion mobility spectrometry of the chlorine; then according to Cl - The migration time position in the spectrogram enables chlorine and total chlorine to be qualitatively detected; obtaining chlorine series Cl - The intensity of the peak at the time position in the spectrogram, and making a standard curve for measuring chlorine according to the analog curve of peak intensity-concentration; obtaining total chlorine series Cl - The signal intensity of the hydrogen chloride is obtained by subtracting the signal intensity of the chlorine from the total chlorine signal intensity by 1.338, and a standard curve for measuring the hydrogen chloride is made according to a simulation curve of the peak intensity-concentration; measuring Cl of unknown sample - At the response timeThe intensity of the peak, the level of chlorine and hydrogen chloride in the sample was obtained.
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| CN202311722434.8A CN117630151A (en) | 2023-12-14 | 2023-12-14 | Device and method for detecting chlorine and hydrogen chloride respectively with high sensitivity by ion mobility spectrometry of non-radioactive ionization source |
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